WO2000061917A1 - Procede et dispositif pour l'injection de pates durcissables dans des cavites - Google Patents

Procede et dispositif pour l'injection de pates durcissables dans des cavites Download PDF

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Publication number
WO2000061917A1
WO2000061917A1 PCT/SE2000/000436 SE0000436W WO0061917A1 WO 2000061917 A1 WO2000061917 A1 WO 2000061917A1 SE 0000436 W SE0000436 W SE 0000436W WO 0061917 A1 WO0061917 A1 WO 0061917A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection pipe
pipe
injection
compound
cavity
Prior art date
Application number
PCT/SE2000/000436
Other languages
English (en)
Inventor
Bengt Arvidsson
Original Assignee
Bengt Arvidsson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bengt Arvidsson filed Critical Bengt Arvidsson
Priority to AU41544/00A priority Critical patent/AU4154400A/en
Publication of WO2000061917A1 publication Critical patent/WO2000061917A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/001—Improving soil or rock, e.g. by freezing; Injections

Definitions

  • the present invention relates to a method for the injection of hardenable compounds in cavities by means of an injection pipe having front and rear ends and an inlet mouth through which a flowing compound from outside is fed into the interior of the pipe, as well as an outlet mouth positioned in the front end of the pipe through which mouth the compound is further fed into the cavity to be injected, the injection pipe being fixed and sealed in the cavity by means of an elastic, expandable ring on the outside of the pipe.
  • a mixture of water and finely pulverized cement, possibly in combination with suitable addi- tives, is commonly used as a compound.
  • the reason for using finely pulverized cement without coarse-grained ballast material is that it is desirable that the mortar should penetrate into and fill also finer channels, such as cracks, pores and the like, adjacent to the individual bore hole with the ulti- mate purpose of bringing about a liquid-sealed and strong structure in the surface layer closest the rock wall.
  • the cement mortar has been pressed into the drilled cavity via the injection pipe with a high pressure (10-20 kg/cm 2 ) for the purpose of bringing about an optimum penetration of the mortar also in the fine channels or cracks adjacent to the cavity.
  • a high pressure 10-20 kg/cm 2
  • investigations, on which the present invention is based have shown that the use of high pressures in connection with the injec- tion of the mortar or the compound is inappropriate.
  • the mortar during influence of the high pressure is dewatered in a way which counteracts penetration of the cement particles in the very finest channels of the rock structure.
  • the intellectual experiment may be made that the mixed compound of water and the fine, solid cement particles is introduced a sack with porous, permeable walls, and then the compound is pressurized. Since the water is of low viscosity and follows the law of least resistance, the water will primarily pass the pores in the wall of the sack, while the majority of the solid particles remain in the sack without accompanying the water.
  • the cement compound conducts in the same way when the same is injected with a high pressure into drilled rooms in rock or soil.
  • the thick bore hole is filled up in a fast and simple way by the cement compound, but when the compound then is to pass out in the finer channels adjacent to the hole, the compound is dewatered so that primarily only the water penetrates into the channels. It is true that also the solid cement particles will partly penetrate into the channels, but the longer and finer these are, the more marked the tendency will be that the channel portions positioned innermost and furthest away from the bore hole are filled with or are passed by water, while the cement particles are stopped closer to the bore hole room. The result of a mediocre filling ratio in the finest channels of the rock structure will, of course, be a structure with moderate density and strength.
  • a primary object of the invention is to provide an injection method which can give a considerable improved den ⁇ sity in such rock or earth structures which include fine as well as long channels in the form of cracks, pores and the like.
  • the invention also relates to a device by means of which the method may be carried out in a simple way.
  • the features of this device are defined in claim 3.
  • An advantageous embodiment of the device according to the invention is furthermore defined in the dependent claim 4.
  • Fig 1 is a longitudinal section through an injection device according to the invention
  • Fig 2 is a partial longitudinal section through an alternative embodiment of the device, an expandable ring being shown in a starting position
  • Fig 3 is an analogous longitudinal section showing the same ring in an expanded, fixing state
  • Fig 4 is a section showing the device according to fig 1 in a state immediately before the insertion in a drilled hole
  • Fig 5 is a section showing the same device inserted in the bore hole, mortar being injected therein, and Fig 6 is a section showing the bore hole after finalized injection.
  • the device shown in fig 1 includes an injection pipe, in its entirety designated 1, which has a front end 2 and a rear end 3.
  • the inside of the pipe 4 opens at the front end 2 in a mouth 5 through which cement mortar or other injection compound may be fed out of the pipe.
  • the mouth 5 forms an outlet for the mortar.
  • an elastic and expandable ring 6 e.g. of rubber
  • This rubber ring is arranged outside a cone-shapedly tapering sleeve 7 which is connected to a cuff 8, which in turn is rigidly connected to a nut 9, the interior thread of which is in engagement with an external thread 10 on the injection pipe.
  • the cuff and the sleeve may be displaced axially along the injection pipe, the conicity of the sleeve 7 being used to expand the rubber ring 6.
  • Expansion of the rubber ring 6 has the double function of fixing the injection pipe in the desired cavity as well as sealing the ring-shaped passage between outside of the injection pipe and the inside of the cavity.
  • a rubber ring 6' is arranged directly outside the injection pipe 1, more precisely between an axially movable cuff 8' and a fixed adjusting ring 11.
  • the rubber ring 6' has a minimal outer diameter.
  • the rubber ring 6 1 is compressed in the axial direction, the outer diameter increasing. In that manner, the ring 6' may fix and seal the injection pipe in the current cavity.
  • fig 1 is shown how a hose 12 is connected to the injection device.
  • the mortar or the com- pound may be supplied from an external source (not shown) , which includes a pump suitable for the purpose.
  • the supply hose or conduit 12 has been connected to the rear end of the injection pipe 1 in the axial extension thereof.
  • the cement mortar has been supplied under high pressure, (10-20 kg/cm 2 ) .
  • Characteristic for the device according to the inven- tion is that a branch pipe 13 is connected to the injection pipe 1, more precisely at a point at a certain distance from the rear end 3 of the injection pipe. At a free end, distanced from the injection pipe, this branch pipe 13 has an inlet mouth designated 14. In practice, this mouth is housed in a schematically shown coupling 15 for connecting the pipe 12 to the branch pipe. In the coupling 15 or in the vicinity thereof, there may advantageously also be a cut-off valve (not shown) . In the area of the rear end of the pipe 1, there is an gable wall or a gable piece 16 with a through bore 17, suitably situated centrally. A body 18 being movable to and fro is arranged in this bore.
  • This body has a long narrow shape and the character of a piston, which, for instance, may consist of a cylindric bar or rod.
  • a first end 18' of this piston is situated inside the gable piece 16, while an opposite end 18" is situated outside the gable piece 16.
  • The. end portion 18" positioned outside the gable piece may be connected to a percussion mechanism (not shown), e.g. a conventional poker vibrator.
  • a percussion mechanism not shown
  • two stopping members are shown schematically which have the purpose of preventing the piston from falling out of the appurtenant bore.
  • the piston may be set in fast, intermittent motions which apply impact motions to the mortar positioned in the interior of the injection pipe which impact motions set the mortar in vibration.
  • the front end portion 18' of the piston 18 is located approximately at the point of intersection between the oblique branch pipe 13 and the injection pipe 1.
  • the angle of the branch pipe 13 in relation to the injection pipe may vary most considerably, the same should in practice be within the range of 30-60°, the branch .pipe extending obliquely outwards/backwards from the injection pipe.
  • a venting valve 21 which normally is closed, but which, if required, may be opened so as to vent the interior of the injection pipe, may be arranged in the cylinder wall of the injection pipe 1.
  • figs 4-6 illustrate the method according to the invention.
  • fig 4 is shown how a cavity 22 is present in a rock wall 23, which in this example is assumed to extend vertically.
  • the cavity 22 has been brought about by drilling, and therefore the same has a cylindric basic shape.
  • a crack which is shown on an exaggeratedly large scale, is designated 24.
  • the purpose of the injection is to reinforce the surface layer of the rock wall by, as far as possible, filling out those cracks, pores or other fine channels which are present in the surface layer of the rock adjacent to the wall 23.
  • the depth of this surface layer may be within the range of 0,5-1 m.
  • fig 4 the device according to fig 1 is shown in an empty state outside the cavity 22, a schematically illustrated percussion mechanism 25 being shown connected to the vibrator piston 18.
  • fig 5 the device is shown with the front end portion of the injection pipe 1 inserted in the cavity 22.
  • the rubber ring 6 is brought to expand until the same is forcefully pressed against the inside of the cavity 22.
  • the injection pipe is fixed in the cavity at the same time as the ring-shaped passage between the outside of the pipe and the inside of the cavity is sealed.
  • cement mortar 26 is introduced to the interior of the injection pipe via the supply hose 12 and the branch pipe 13.
  • the mortar should be fed in under low pressure, e.g. within the range of 2-8, suitably 3-5 kg/cm 2 .
  • the percussion mechanism 25 is activated, which sets the piston 18 in motion to and fro, more precisely in intermittent, fast motions.
  • the mortar preserves the homogeneity thereof also into the finer channels in the rock, which communicates with the cavity.
  • the vibrations which are applied to the mortar have proved to entail that the solid particles of the mortar penetrates into the channels in an effective way.
  • the network of intercommunicating, fine channels in the shape of cracks and pores which are included in the rock is, therefore, in the main filled out completely while achieving high strength and density in the surface layer of the rock surrounding the individual, injected cavity.
  • the device according to the invention for rinsing the fine channels of the rock before injection.
  • the injection pipe 1 is fixed and sealed in the same way as has been described above, but instead of cement mortar, water is fed into the same and further out in the cavity together with the complicated network of fine channels which communicate with the cavity.
  • Tests have shown that rinsing during 10 to 20 minutes is sufficient to effectively eliminate loose particles from the channel system inside the rock. After performed rinsing, drying may take place during a suitable time.
  • fig 6 is shown how the injected cavity may be sealed by means of a plug 27, e.g. consisting of wood or rubber, when the cement mortar has begun to solidify and the injection pipe has been removed out of the cavity.
  • cement mortar it is also possible to use other compounds that may be hardened and solidified after initially having had a liquid form.
  • a pure cement mortar is, however, preferred with most finely ground cement particles.
  • the invention may also be applied ⁇ for the injection of masses of earth or constructions of brick, con- crete and the like, other injection compounds possibly being appropriate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Agronomy & Crop Science (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Paper (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

Selon l'invention, un dispositif d'injection comprend un tuyau d'injection (1) présentant une partie avant et une partie arrière (2, 3). Un anneau (6) élastique expansible est placé sur le côté extérieur du tuyau (1) et sert à créer l'étanchéité autour de ce dernier et à le bloquer dans un trou foré. En un point situé à une certaine distance de l'extrémité arrière (3) du tuyau d'injection, est connecté un tuyau d'embranchement (13) qui peut lui-même être relié à un flexible (12) servant à amener du mortier ou de l'eau à l'intérieur du tuyau d'injection. Dans une pièce arrière (16) est placé un piston (18) qui peut effectuer un mouvement de va-et-vient et peut être relié à un mécanisme de percussion extérieur de façon à mettre en vibration le mortier ou la pâte se trouvant à l'intérieur du tuyau d'injection. Pendant l'injection, le mortier est conduit sous basse pression dans le trou foré.
PCT/SE2000/000436 1999-03-30 2000-03-06 Procede et dispositif pour l'injection de pates durcissables dans des cavites WO2000061917A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41544/00A AU4154400A (en) 1999-03-30 2000-03-06 Method and device for the injection of hardenable compounds in cavities

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9901153-8 1999-03-30
SE9901153A SE512113C2 (sv) 1999-03-30 1999-03-30 Förfarande och anordning för injektering av härdbara massor i hålrum varvid massan sätts i vibration

Publications (1)

Publication Number Publication Date
WO2000061917A1 true WO2000061917A1 (fr) 2000-10-19

Family

ID=20415055

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/000436 WO2000061917A1 (fr) 1999-03-30 2000-03-06 Procede et dispositif pour l'injection de pates durcissables dans des cavites

Country Status (3)

Country Link
AU (1) AU4154400A (fr)
SE (1) SE512113C2 (fr)
WO (1) WO2000061917A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121810A1 (fr) * 2006-04-24 2007-11-01 Köster Bauchemie AG Garniture d'ÉtanchÉité et son procÉdÉ de fixation et introduction d'UN matÉriel d'injection sous pression dans une fissure, UN trou et analogue dans un ÉLÉMENT DE CONSTRUCTION ou UN ÉDIFICE, tout comme SA coquille d'expansion fendue
CN102720461A (zh) * 2012-06-11 2012-10-10 中铁隧道集团有限公司 液压凿岩台车止浆方法及止浆装置
EP2561176A4 (fr) * 2010-04-19 2018-04-04 GMA Ground Machinery Applications AB Dispositif pour étanchéifier une paroi rocheuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413929B (sv) * 1977-09-02 1980-06-30 Trelleborgs Gummifabriks Ab Injekteringsanordning
SE435201B (sv) * 1979-09-19 1984-09-10 Armerad Betong Ab Sett att teta veggarna i tunnlar och liknande bergrum mot intrengande grundvatten
SE466066B (sv) * 1990-04-25 1991-12-09 Knut Nordvall Betongtaetning A Injekteringsanordning
WO1997018367A1 (fr) * 1995-11-15 1997-05-22 Juha Haavisto Tampon et procede d'injection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413929B (sv) * 1977-09-02 1980-06-30 Trelleborgs Gummifabriks Ab Injekteringsanordning
SE435201B (sv) * 1979-09-19 1984-09-10 Armerad Betong Ab Sett att teta veggarna i tunnlar och liknande bergrum mot intrengande grundvatten
SE466066B (sv) * 1990-04-25 1991-12-09 Knut Nordvall Betongtaetning A Injekteringsanordning
WO1997018367A1 (fr) * 1995-11-15 1997-05-22 Juha Haavisto Tampon et procede d'injection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121810A1 (fr) * 2006-04-24 2007-11-01 Köster Bauchemie AG Garniture d'ÉtanchÉité et son procÉdÉ de fixation et introduction d'UN matÉriel d'injection sous pression dans une fissure, UN trou et analogue dans un ÉLÉMENT DE CONSTRUCTION ou UN ÉDIFICE, tout comme SA coquille d'expansion fendue
EP2561176A4 (fr) * 2010-04-19 2018-04-04 GMA Ground Machinery Applications AB Dispositif pour étanchéifier une paroi rocheuse
CN102720461A (zh) * 2012-06-11 2012-10-10 中铁隧道集团有限公司 液压凿岩台车止浆方法及止浆装置
CN102720461B (zh) * 2012-06-11 2014-10-29 中铁隧道集团有限公司 液压凿岩台车止浆方法及止浆装置

Also Published As

Publication number Publication date
AU4154400A (en) 2000-11-14
SE9901153L (sv) 2000-01-24
SE512113C2 (sv) 2000-01-24
SE9901153D0 (sv) 1999-03-30

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